Condenser for refrigerators



Sept. 5, 1950 L. w. CASETTA CONDENSER FOR REFRIGERATORS 2 Sheets-Sheet 1 .5 EVA PORA TOR Filed June 11, 1945 1 5155222221 BE Ea ig} /4 Jim/77157.9.

Sept. 5, 1950 L. w. CASETTA CONDENSERFOR REFRIGERATORS 2 Sheets-Sheet 2 Filed June 1, 1945 I jn-vezezar lee WCasezza y MM Patented Sept. 1950 UNITED STATES PATENT OFFICE 2,521,040 CONDENSER FOR REFRIGERATORS Lee W. Casetta, Fond du Lac, Wis.

Application June 11, 1945, Serial No. 598,720 g My invention relates to an improvement in condensers for refrigerators and the like. It has for one object to provide an improved condenser for use in a refrigerating cycle.

Another purpose is to provide an improved condenser structure for refrigerators, in which the high pressure pipe from the compressor is associated with the returning suction line in a finned condenser structure.

( Another purpose is to provide a system for effecting cooling of the condenser in relation to the surrounding air temperature and for thus reducing high head pressure on the compressor. Other purposes will appear from time to time throughout the specification and claims.

'7 Claims. (Cl. 62115) I illustrate my invention more or less diagrammatically in the accompanying drawings,

wherein- Figure 1 is a diagrammatic illustration of a refrigerating system in which my invention is employed; 7

Figure 2 is a section on an enlarged scale on the line 2-2 of Figure 1;

Figure 3 is a section on an enlarged scale on the line 3-3 of Figure 1;

Figure 4 is a similar section through a variant form;

Figure 5 is a side elevation of a variant'form of condenser with parts in section; Figure 6 is a section on an enlarged scale along the line 6-6 of Figure 5; i

Figure 7 illustrates my invention applied to a hermetic compressor inconnection with a condenser which may be cooled by naturaldraft;

Figure 8 is a side elevation of the structure shown in Figure 7; and

Figure 9 is an end elevation of the structure shown in Figures 7 and 8. Like parts are indicated by like characters throughout the speciflcationand drawings. Referring to the drawings, l generally indicates any suitable compressor, the details of which do not form part of the present invention. 2 is an suitable motor through which the compressor may be driven by the belt 3 and the driven pulley 4. 5 indicates diagrammatically any suitable evaporator. 6 generally indicates the condenser; 1 generally indicates the receiver and 8 any suitable expansion valve. The high pressure vapor line It] extends from the compressor to the condenser E. I I is any suitable suction or return line for returning vaporized refrigerant from the evaporator; tofthe compressor. i2 are any suitable 'fins for the evaporator. As will be clear from Figure l, the high pressure vapor line, as it enters communication with the fins l2, or before, is associated with the suction return line I I, the two being secured together in any suitable manner by welding, brazing or the like, or with a press fit.

Whereas I have described and shown a conventional belt driven reciprocating piston condenser, it will be understood that my invention is equally effective if used with a hermetic or sealed condensing unit. It will also be understood that my invention is equally applicable whether a static condenser or a forced draft condenser is employed.

In Figure 3 1' illustrate the pipes l0 and II as welded together. I may, however, employ a double pipe structure as at Illa, Ila in Figure 4, which constitutes in effect a single pipe defining two ducts. At or near the point at which the pipes leave the finned structure, they diverge as at B, the suction pipe H returning to the intake of the compressor 1 and the high pressure line l0, delivering liquefied refrigerant to the receiver 1. The high pressure liquid refrigerant flows from the receiver 1 along the pipe I! to any suitable expansion valve 8,whence it reaches the evaporator 5 at reduced'pressure and is evaporated therein.

In the form of Figures 5 and 6. the structure is varied by carrying the high pressure pipe llb inside of the suction pipe Hb as the two pipes pass through the fin structure I2a. Otherwise the arrangement is shown in Figure 1.

Referring to Figures 7, 8 and 9-, '20 generally indicates any suitable hermetically sealed compressor the details of which do not form part of the present invention. It will be understood, however, that the motor component'and a compressor component are housed within "an outer casing. The casing is mounted for example by supports 2 upon a finned condenser structure generally indicated as 22 which includes a plurality of individual fins 23. 24 illustrates the suction or return duct from the evaporator not herein shown, to the compressor unit 20. 25 illustrates the high pressure duct extending from the compressor through which the refrigerant is delivered under pressure for passage through the condenser. It will be observed that, at a short distance from the compressor unit, the high pressure delivery duct 25 extends into and is enclosed by the suction or return duct 2. Thus the duct 24, as it extends through and in contact with the fins 23, encloses the high pressure delivery duct 25. The end of the high pressure duct 25a extends from any suitable part of the high pressure refrigerant duct 25 which extends from the compressor assembly to the finned condenser. The thermal contact between the returning refrigerant and the refrigerant delivered under compression may be quite effective even Without contact in the condenser itself, because the hottest discharge gas leaving the compressor is the high pressure refrigerant vapor in that part of the high pressure duct ivhich-extends directly from the compressor unit to the finned condenser itself. However,

it is advantageous, as shown in Figures 7, 8 and 9 supply duct as enclosed within the return coa or suction duct 24, the two ducts maybe related as shown in Figures 3 and 4. g

It Will be realized that whereas I have shownand described an operative structure, still many I changes might be made in the size, shape, arrangement and numbero'f parts without departing materially iron; the spirit" of my inwarit therefore, water 'shfowing bejtal i'e iii a broad sense diagramrriaucaud r'a'th'rtha'n l'iniitin'g to my pr t ise showing. The use and operation are -as follows";

provide a systemror 'eife'ctive eoofifig' 'or the condenser inriauonto thegsurroaneio ameniprature." My structure reuutes high head pressure on ur onipresser iii the condenser and the liquid receiver. As. cold gas or vapora ed t refrigerant returns rrtm" the evaporator 5 through the suction pipe l'iL-tb the compressor, oin t e i h r s u epi a s which the refrigerant is jdgelivred at highyres'sureon the compressor to the condenser The cold gas or vapor in the suction pipe 1| transmits its cooling effect to the contents of the high pres: sure pipe 19, As the pipes passtogetherthrough the finned structure of the condenser, heatfrom the; hot discharge or high-pressure -pipe [ibis transmittedto the contents pf the eold low' pres:- sure or suction pipe ll, result is asu b stantia-l improvement inlthe efiiciency- 'ofthe unit. It tends-toyreduce the high pressure of hot-compressed refrigerant as it leaves the corn":

pressor. It also helps to cause the-evaporation of; such liquid refrigerant as -may belowingfto- Ward the compressor through the suction or 'returnpipe il. This reduces the wcrk of thecgm pressor-and tends to'reduce the -slug g-ing of "oil through thecompressor yalVes hich slugging may at times produce objectionableloudlmocking noises. 1 I I V g It will be understood that the hot high pressure -jpipe and the cold suction --or return :pipe may be; associated with each -other in a variety of ways. The two pipes maybe welded; soldered or' tinned to each otheras shown in Figure 3, or they play be molded together "or; ,unitarily formed asshov/n in Figure' l. The high pressure pipe I 3b may also conveniently be inserted i-n-and carried through the low pressure or suctionpipe Hb as shownin Figures- 5-and:6. theyhigh pressure pipeI-ii is subjected not only to the cooli-ng-efiect of the condenser fins libut-also to the cooling effect of the cold return pipe l Ii Where the form of Figures 5 -ar1d-6 are employed, the high -p ressure,-hightemperature pipe b issurrounded by thecold contents of thelowpressure return pipe lb, the hot refriger-antand theeold refrigerant beingsepar-ated only by the heatcon-= ductivewall of the pipe lflb. H V

nda van eeq s Shown -e-Fierw 33 1 torput 512% u ra t rei film ll the return duct '24 in thermal contact with that to maintain the thermal connection throughout the en'tire length'of passage of the high pressure duct 25 through the condenser I claim:

L.- -ai'eii ig rating apparatus, a compressor and m eans for actuating it, an evaporator, a suctioiireturn pipe extending from said evapoe rator to said compressor arcondenser, said suctron .pi'p eitiidifig through said condenser, a" gh pre 'e' ver p-i e 'e'xtend rug from-said com and forming-part orthe -eonaens g a u suction return pipe and high pre sure tl'el erypipe bemg in uateszcuaage rerauonsifip as they-{pass through [said "condenser;

2. ma rfrigeratiri and means for actu ppa atus, "a compressor '8 it, ahfevaporatoi"; "a uction return p'ipe'ex' ng from said evaporator to "said ccmpre so ,ahi'gh'pressure delivery pipe exteucfihgrroin said compressor to said evaporator, pressure "eauction' means, in; line of d 'iverypf a high pressure pipefto the evaporator, Y clul'ing a part oi the high pressure pipe, part of the suction return pipe, in directheat transfer relationship with each other, ahda plurality of heatfftrar'isfer relationship with both pipes where they are-in remtionship wit1 each other. 3. In a remgeratorsyste pressor and means for a'ct' tor", amen-pressure duct name from said compressor to said evaporator, pressure reduc tio'n means, *in' 'saiauaemerwen the compressor and the evaporator and a suction returnpipe fr'oiii saii'i' evaporator to 'saiiicofi1pressor; said suction return pipe n heat exc a g'e re pressure pipe'adj'a'cent the point at whichsaiuhigii pressure *pipe haves including" a comin itgan evaporat pressor andnteans for actiiatiing it',

rator',a high pressure duct extenuing 'froih compressor to said evaporator, pressure reduc use 'ineans, rn-satii' uuct' between t e compressor and the evaporator'jandasuetion return pipe" from said evaporator to said Oli pi f tending-into bysaidfsuctioh retur v I 5,111 "arefr grator-sys'tem includinga tom pressor-ancmean for actu 'ting it, an "evapoe r'a ,ja" high duct ertendmgrioin-sara compressor to "said vaporator, "pressure reduction "means; in said uuct, between the comprs sor and "the evaporator anda suction return om evaporate to "saidcompressor',

r n re urn pe' ngfinl'heat'feicliaiig relationship with said "high pressure pipe not:

ressor' to said evaporator pipe leaves the compressor and for a substantial distance therealong.

6. In a high side unit for a refrigerating system, a hermetic compressor-motor assembly, a condenser including a plurality of fins, a. suction return line in heat exchange relationship with said fins, extending to the compressor component of said assembly, and a high pressure pipe extending from the compressor component and in heat exchange relationship with said fins and. with said low pressure return pipe.

'7. In a refrigerating apparatus, a compressor, and means for actuating it, an evaporator, a high pressure delivery pipe extending from the compressor to the evaporator, and a suction return pipe extending from the evaporator to the compressor, the two pipes being, for a portion of their length, in heat exchange relationship, a plurality of fins in heat exchange REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,745,544 Karmazin Feb. 4, 1930 1,806,019 Mufliy May 19, 1931 1,823,919 Smith Sept. 22, 1931 2,073,092 Bergholm Mar. 9, 1937 2,111,618 Erbach Mar. 22, 1938 2,181,354 Winters Nov. 28, 1939 2,300,086 Alsing Oct. 27, 1942 

